Artificial Selection

11) Fertilization is
2) Another name for sex cells is .
3) How are the egg and sperm cells are adapted to their functions?
4) Where is the genetic information in the cells contained?
5) Humans have ..chromosomes
6) A gene is .
7) DNA is
8) A chromosome is ..Teachable.net 2008. Some rights reserved http://teachable.net/res.asp?r=1896 How much do I already know?2Describe what is happening hereWhat do these images images

1Artificial
SelectionTeachable.net 2008. Some rights reserved
http://teachable.net/res.asp?r=1896 2All our modern breeds of dog are descended from the wolf.3So how come they all look and act so differently?4Gamekeepers in the 1800s had a problem. Poachers were entering their land and stealing their game-birds before the shooting season. Their dogs (mastiffs) were big strong dogs and great companions but they were not aggressive or fast enough to chase after the poachers. Another breed known to them was the bulldog. This was quick and aggressive but not strong enough to pull the poachers down and hold them until a gamekeeper arrived.What could they do?5Humans have changed the way dogs look and act by choosing which dogs to breed together. This is called
Selective BreedingPerfect!+6We already know about natural selection
Today we are looking at artificial selection (also called selective breeding)
Copy the definition
In selective breeding people choose organisms with useful characteristics to mate and pass on their

Inheritance and Selection
In the box below write or draw as much as you can to discuss the statement below:
Breeding horses is a million pound industry.
Explain how people breed race horses.
Describe any advantages or disadvantages.
False statements
Each statement is false. Rewrite each one as a true statement showing as much scientific understanding as possible.
You inherit your looks from your parents because they pass jeans on to you
A scar is an inherited characteristic
Inherited variation is caused by your surroundings
If body cells contain 24 chromosomes sperm will contain 48 chromosomes
A human female sex cell is called an ovary
Breeding for desirable features is called natural breeding
The sex cells in plants are the stamen and stigma
Sexual reproduction produces identical copies of one and other
The movement of a pollen grain from one flower to another is called fertilisation
Two animals that are exact copies of each other are called drones drones